Gear



'Feb- 1930. A. M. ALEX'ANDRESCU 1,748,820

GEAR

Original. Filed Dec. 17. 1927 2 Sheets-Sheet 1 how Feb. 25, 1930. A. M. ALEXANDRESCU 1,743,320

GEAR

Original Filed Dec. 17, 1927 2 Sheets-Sheet 2 //1 llllllM/ll/llf/l .ment. ,j I

f Figure 7 is'a sectioncorrespondingto that show in Figure 3, and illustrating the mode of assembling the two toothed disks in order .metal than the driving gear H, see;Figure; 1 7

Patented Feb. 5, 93 :61 if a" h IUNITE'DYST'IW .ALQEXANDER M. ALnXANDREscU, or cnnvnnmvnoirio GE R.-

"Application filedneceniberli, 1927, S.eria1 No.'2 40,764, e e ter-111a, 9, 1930. 1

My present invention relatest-o improve ments in; adjustable gears, and it intend ed to provide a gear whose teeth will auto m'atically adjust themselves to" compensate i -for wear, and to also prevent noise and to prolong'thehfe of the gear. The invention comprises a compound gear composed V of two connected toothed disks, one 'of which c is adjustable tothe other, and, after once bein ing adjusted, they adapt themselves to a driving or other gear meshing therewith, as Will be hereinafter described. My" invention is intended to provide a modification of. the apparatus illustrated and described in my application filed November 16, 1927 Serial No; 232,692, and entitledlmprovements in gears; and also provide a modificationof my apparatus, shown in my coa" pending application240,'763, filed'DecQl'Z,

1927 ,also entitled; Improvement in gears,

. V which has matured into Patent 1,7 46,178," I

V V My invention will bemore fully understood after reference to theaccompanyingdrawings in which like parts are indicated by' similar reference symbols throughout the 7 several" v1ews',.and1n which,

. Figure 1 is a side elevation ofthe coin-i pound gear and driving gear meshed therewith, parts being broken away."

F gure 2 shows a SG CtIOII'alODg mp u dsea a Figure 6 is a similar'view to Figure 5, showf-ingthe alignmentoffthe teeth after ad ustto cut the teeth 'onsame.

A represents the'body portion of the-com j the broken line 2-2 of igure'l, looking in the direction tary view showing a position, parts.

fragmentary plan view showcured.

pound gear, whose per'iphery is flanged as at A, and provided" with teeth a. This body portion is also provided with a shoulder a on its hub.

' B represents an annular disk flanged on its periphery as at B, and provided Withteeth 6' cut with the same pitch as the teeth a.

l 1,748 ,s zef The inner wall of this disk slips freely over the shoulder a. I

C represents an annular plate or ring, which is mounted concentric withthe disks A and B, andthese parts A, B andC are connected ln Figure 2, 1 have shown the heads of bolts arefpreferably provided with cylindrical bosses d, which pass freely through the fh'oles 79. provided inthe disk B. These holes 1)? areof largerdi'ameter than the bosses df, so

' together by thebolts D, which bolts are firmly I secured at one end inthe disk A, as by swagmg, or by screw connections, orotherwise;

these bolts D swaged into the disk A. These V I as to permit the angular adjustment herein after described; The plate 0 is clamped againstthe outer faces of these bosses cl by means of the nuts E. 1 Suitable washers may be provided for these nuts, if desired? In order to hold the disks A andB'in fricti'o'na'l engagement, I provide a series of stout a springs Fmiounte d in sockets I of the disk B, and interposed between sa'iddisk B and ring C, as shownln vF1gures'2 andi3.

These s'pringsfF will force the disk 3 back against the disk A, butlwill permit angular movement between the two disks as tangential pressure is applied. '7 vIn order to supply such" tangential pressure, I provide as'eries of springs G mounted in chambers btofthe'diskEwhich engage the" v bosses d of the bolts D, and thusex'ert a con- 1 stant pressure tending to rotate the disk B in one direction, to the left, or as indicated the arrows X, as shown in Figures'l andvt. Thus these springs will always tendtoforce the diskB with the teeth bf in the: 'direction .to compensate for thewe'arof the teeth a,

and thus automatic adjustment will'be se;

By having the disks and'B made of softer Q I the gear teeth will in alarge measure be'pre;

vented from getting rough, and excessive noises prevented, and the life of the gears is prolonged. V

For this purpose, I prefer to make the driving gear of tempered steel, and the disksB and A of softer material, such as soft steel. By the herein described construction, an extremely nice adjustment between co-acting gear teeth is effected, and lost motion between the gears is largely avoided, with the result that the excessive noise is in a great measure prevented, and the life of the gears is mate rially prolonged For convenience in separating the disks, B and A, or for taking same off the shaft, not shown, when desired,lthese are provided with holes a and 6 respectively, for the insertion of suitable tools.

The two disks are also provided with looking holes a? and b as shown in Figures 1 and 4 for the insertion of a drift pin while cutting the teeth a and b.

In order to cut the teeth a and b simultaneously and accurately in the first instance, I mount the disk B upon'the hub a-of the disk A in the position shown in nigure 1, then apply the boltsD with their bosses cl resting against the shoulders K provided between the holes Z)" and chambers Z2 By inserting a short drift pin in the holes a and b and screwing down on the nuts I provided for the bolts D as shown in Figure 7, the two disks are locked together and in the position to cut teeth.

After the teeth are cut with aback lash of preferably 5/1000 of an inch the nuts I are removed, the springs b and b are inserted, nextthe ring C applied so as to engage the threaded ends (Z of the bolts D, and then the nuts E applied and screwed down tight on the bolts D as shown in Figure 1. The parts so assembled are ready for installation in a machine at which time the drift pin is removed from the lioles a and Z), thus-releasing the disk B to automatically adjust itself and be forced to move by the springs G in the direction indicated by the arrowX, shown in Figure 1. This form of gear as illustrated cannot be driven in both directions and is designed to be driven" in the one direction indicated-by the arrow X. .7

In case it is desirable to have a gear of this type to be driven in the opposite direction shownflby the arrow Z in Figure 1, then the chambers 73 are cut at a pointin the holes 6 diametrically opposite to that illustrated. While I have illustrated and described one embodiment of the invention in its preferred form it will be obvious, that various changes might be made in the construction,pombination, and arrangement of parts which could beused without departing from the spirit of my invention, and I do not meanto limit the invention to such details except as par ticularly pointed out in the claims.

, ont of the United States is 1. A gear of the character described, comprising a main disk flanged at its periphery and'provided with gear teeth on said periphery and with a shouldered hub, an annular disk also flanged at its, periphery and provided with similar gear teeth, the said second disk being slipped over said hub, bolts secured to the main disk and passing freely through bolt holes inthe annular disk, a ring mounted on said bolts, with nuts holding said ring against outward movement,

springs under compression interposed between said ring and said annular disk, for holding said disks in frictional engagement, and springs under compression tangentially interposed between said bolts and said annular disk tending to move one disk through an angle relative to the other, substantially as and for the purposes described.

2. A gear of the character described, comprising a main disk flanged at its periphery and provided with gear teeth on said periphery and with a shouldered hub, an annular disk also flanged at its periphery and provided with similar gear teeth, the said second disk being slipped over said hub, the said annular disk being provided with sockets and bolt holes having lateral wing chamers, bolts secured to the main disk and passing freely through said bolt holes in the annular disk, a ring mounted on said bolts, with nuts holding said ring against outward movement, springs under compression.

mounted in said sockets and interposed between'said ring and said annular disk, for

holding said disks in frictional engagement, and sprmgsunder compression mounted in said'wing chambers and tangentially interposed between said bolts and said annular disk tending to move one disk through an angle relative to the other, substantially as and for the purposes described.

3. A gear of the character described, comprising a main disk flanged at its periphery and provided with" gear teeth on said periphery and with a shouldered hub, an annular disk also flanged at its periphery and provided witn similar gear teeth, the said second disk being slipped over said hub, bolts secured to the main disk and passing freely through bolt holes in the annular disk, a ring mounted on said bolts, with nuts hold ing said ring against outward movement, springs under compression interposed be;-

tween said ring and said annular disk, for holding said disks 1-11 frictional engagement,

and means for automatically moving one disk through a small angle relative tothe other, substantially as and for the purposes. described. a

' ALEXANDER" M, ALEXANDRESCW 

